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-rw-r--r--crypto/salsa20_generic.c75
1 files changed, 36 insertions, 39 deletions
diff --git a/crypto/salsa20_generic.c b/crypto/salsa20_generic.c
index b07d55981741..eac10c11685c 100644
--- a/crypto/salsa20_generic.c
+++ b/crypto/salsa20_generic.c
@@ -24,6 +24,7 @@
24#include <linux/errno.h> 24#include <linux/errno.h>
25#include <linux/crypto.h> 25#include <linux/crypto.h>
26#include <linux/types.h> 26#include <linux/types.h>
27#include <linux/bitops.h>
27#include <crypto/algapi.h> 28#include <crypto/algapi.h>
28#include <asm/byteorder.h> 29#include <asm/byteorder.h>
29 30
@@ -42,10 +43,6 @@ D. J. Bernstein
42Public domain. 43Public domain.
43*/ 44*/
44 45
45#define ROTATE(v,n) (((v) << (n)) | ((v) >> (32 - (n))))
46#define XOR(v,w) ((v) ^ (w))
47#define PLUS(v,w) (((v) + (w)))
48#define PLUSONE(v) (PLUS((v),1))
49#define U32TO8_LITTLE(p, v) \ 46#define U32TO8_LITTLE(p, v) \
50 { (p)[0] = (v >> 0) & 0xff; (p)[1] = (v >> 8) & 0xff; \ 47 { (p)[0] = (v >> 0) & 0xff; (p)[1] = (v >> 8) & 0xff; \
51 (p)[2] = (v >> 16) & 0xff; (p)[3] = (v >> 24) & 0xff; } 48 (p)[2] = (v >> 16) & 0xff; (p)[3] = (v >> 24) & 0xff; }
@@ -65,41 +62,41 @@ static void salsa20_wordtobyte(u8 output[64], const u32 input[16])
65 62
66 memcpy(x, input, sizeof(x)); 63 memcpy(x, input, sizeof(x));
67 for (i = 20; i > 0; i -= 2) { 64 for (i = 20; i > 0; i -= 2) {
68 x[ 4] = XOR(x[ 4],ROTATE(PLUS(x[ 0],x[12]), 7)); 65 x[ 4] ^= rol32((x[ 0] + x[12]), 7);
69 x[ 8] = XOR(x[ 8],ROTATE(PLUS(x[ 4],x[ 0]), 9)); 66 x[ 8] ^= rol32((x[ 4] + x[ 0]), 9);
70 x[12] = XOR(x[12],ROTATE(PLUS(x[ 8],x[ 4]),13)); 67 x[12] ^= rol32((x[ 8] + x[ 4]), 13);
71 x[ 0] = XOR(x[ 0],ROTATE(PLUS(x[12],x[ 8]),18)); 68 x[ 0] ^= rol32((x[12] + x[ 8]), 18);
72 x[ 9] = XOR(x[ 9],ROTATE(PLUS(x[ 5],x[ 1]), 7)); 69 x[ 9] ^= rol32((x[ 5] + x[ 1]), 7);
73 x[13] = XOR(x[13],ROTATE(PLUS(x[ 9],x[ 5]), 9)); 70 x[13] ^= rol32((x[ 9] + x[ 5]), 9);
74 x[ 1] = XOR(x[ 1],ROTATE(PLUS(x[13],x[ 9]),13)); 71 x[ 1] ^= rol32((x[13] + x[ 9]), 13);
75 x[ 5] = XOR(x[ 5],ROTATE(PLUS(x[ 1],x[13]),18)); 72 x[ 5] ^= rol32((x[ 1] + x[13]), 18);
76 x[14] = XOR(x[14],ROTATE(PLUS(x[10],x[ 6]), 7)); 73 x[14] ^= rol32((x[10] + x[ 6]), 7);
77 x[ 2] = XOR(x[ 2],ROTATE(PLUS(x[14],x[10]), 9)); 74 x[ 2] ^= rol32((x[14] + x[10]), 9);
78 x[ 6] = XOR(x[ 6],ROTATE(PLUS(x[ 2],x[14]),13)); 75 x[ 6] ^= rol32((x[ 2] + x[14]), 13);
79 x[10] = XOR(x[10],ROTATE(PLUS(x[ 6],x[ 2]),18)); 76 x[10] ^= rol32((x[ 6] + x[ 2]), 18);
80 x[ 3] = XOR(x[ 3],ROTATE(PLUS(x[15],x[11]), 7)); 77 x[ 3] ^= rol32((x[15] + x[11]), 7);
81 x[ 7] = XOR(x[ 7],ROTATE(PLUS(x[ 3],x[15]), 9)); 78 x[ 7] ^= rol32((x[ 3] + x[15]), 9);
82 x[11] = XOR(x[11],ROTATE(PLUS(x[ 7],x[ 3]),13)); 79 x[11] ^= rol32((x[ 7] + x[ 3]), 13);
83 x[15] = XOR(x[15],ROTATE(PLUS(x[11],x[ 7]),18)); 80 x[15] ^= rol32((x[11] + x[ 7]), 18);
84 x[ 1] = XOR(x[ 1],ROTATE(PLUS(x[ 0],x[ 3]), 7)); 81 x[ 1] ^= rol32((x[ 0] + x[ 3]), 7);
85 x[ 2] = XOR(x[ 2],ROTATE(PLUS(x[ 1],x[ 0]), 9)); 82 x[ 2] ^= rol32((x[ 1] + x[ 0]), 9);
86 x[ 3] = XOR(x[ 3],ROTATE(PLUS(x[ 2],x[ 1]),13)); 83 x[ 3] ^= rol32((x[ 2] + x[ 1]), 13);
87 x[ 0] = XOR(x[ 0],ROTATE(PLUS(x[ 3],x[ 2]),18)); 84 x[ 0] ^= rol32((x[ 3] + x[ 2]), 18);
88 x[ 6] = XOR(x[ 6],ROTATE(PLUS(x[ 5],x[ 4]), 7)); 85 x[ 6] ^= rol32((x[ 5] + x[ 4]), 7);
89 x[ 7] = XOR(x[ 7],ROTATE(PLUS(x[ 6],x[ 5]), 9)); 86 x[ 7] ^= rol32((x[ 6] + x[ 5]), 9);
90 x[ 4] = XOR(x[ 4],ROTATE(PLUS(x[ 7],x[ 6]),13)); 87 x[ 4] ^= rol32((x[ 7] + x[ 6]), 13);
91 x[ 5] = XOR(x[ 5],ROTATE(PLUS(x[ 4],x[ 7]),18)); 88 x[ 5] ^= rol32((x[ 4] + x[ 7]), 18);
92 x[11] = XOR(x[11],ROTATE(PLUS(x[10],x[ 9]), 7)); 89 x[11] ^= rol32((x[10] + x[ 9]), 7);
93 x[ 8] = XOR(x[ 8],ROTATE(PLUS(x[11],x[10]), 9)); 90 x[ 8] ^= rol32((x[11] + x[10]), 9);
94 x[ 9] = XOR(x[ 9],ROTATE(PLUS(x[ 8],x[11]),13)); 91 x[ 9] ^= rol32((x[ 8] + x[11]), 13);
95 x[10] = XOR(x[10],ROTATE(PLUS(x[ 9],x[ 8]),18)); 92 x[10] ^= rol32((x[ 9] + x[ 8]), 18);
96 x[12] = XOR(x[12],ROTATE(PLUS(x[15],x[14]), 7)); 93 x[12] ^= rol32((x[15] + x[14]), 7);
97 x[13] = XOR(x[13],ROTATE(PLUS(x[12],x[15]), 9)); 94 x[13] ^= rol32((x[12] + x[15]), 9);
98 x[14] = XOR(x[14],ROTATE(PLUS(x[13],x[12]),13)); 95 x[14] ^= rol32((x[13] + x[12]), 13);
99 x[15] = XOR(x[15],ROTATE(PLUS(x[14],x[13]),18)); 96 x[15] ^= rol32((x[14] + x[13]), 18);
100 } 97 }
101 for (i = 0; i < 16; ++i) 98 for (i = 0; i < 16; ++i)
102 x[i] = PLUS(x[i],input[i]); 99 x[i] += input[i];
103 for (i = 0; i < 16; ++i) 100 for (i = 0; i < 16; ++i)
104 U32TO8_LITTLE(output + 4 * i,x[i]); 101 U32TO8_LITTLE(output + 4 * i,x[i]);
105} 102}
@@ -150,9 +147,9 @@ static void salsa20_encrypt_bytes(struct salsa20_ctx *ctx, u8 *dst,
150 while (bytes) { 147 while (bytes) {
151 salsa20_wordtobyte(buf, ctx->input); 148 salsa20_wordtobyte(buf, ctx->input);
152 149
153 ctx->input[8] = PLUSONE(ctx->input[8]); 150 ctx->input[8]++;
154 if (!ctx->input[8]) 151 if (!ctx->input[8])
155 ctx->input[9] = PLUSONE(ctx->input[9]); 152 ctx->input[9]++;
156 153
157 if (bytes <= 64) { 154 if (bytes <= 64) {
158 crypto_xor(dst, buf, bytes); 155 crypto_xor(dst, buf, bytes);